Refining process of Al-Ti-B intermediate alloy for pure aluminum

Abstract

The invention provides a process of Al-Ti-B master alloy on grain refinement of pure aluminum. In the invention, except for the addition of the Al-Ti-B master alloy grain refiner in the aluminum melt, the high energy ultrasonic vibration treatment is also adopted, thereby speeding up dissolving and dispersing of TiAl3 phase, increasing the dispersive distribution degree of TiB2 grains and further improving the grain refinement efficiency of the Al-Ti-B master alloy. Industrial pure aluminum as-cast crystal grains treated by the grain refinement process of the invention are all fine isometric crystals, the average size of which is less than 150 mu m, thereby not only improving the quality of aluminum materials but also meeting the requirements on the subsequent rolling of aluminum products.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular, the invention relates to a process for refining pure aluminum by using an Al-Ti-B master alloy. Background technique [0002] Grain refinement is one of the important means to improve the strength and plasticity of materials, and is an important way to improve the quality of aluminum materials. With the widespread use of aluminum materials, especially in high-tech fields, the subsequent deep processing of aluminum ingots and The structure in the process puts forward strict requirements, and the key to controlling its structure and performance is to cast the best as-cast grain structure. Grain size and morphology are important characteristics of the as-cast structure, and fine and uniform equiaxed grains are the best as-cast structure. To obtain this structure, the grains must be refined by different means. The means to refine the as-cast structure of metals and ...

AI Technical Summary

Problems solved by technology

This refinement process can better exert the refinement effect of the Al-Ti-B master alloy, but when the master alloy is added to the aluminum melt, the TiB that was originally agglomerated in a short period of time 2 The compound group is difficult to disperse, its nucleating ability cannot be fully exerted, and in the subsequent rolling processing of aluminum products, the high hardness TiB 2 The agglomeration group is easy to scratch the roll, and there will be perforation and various line defects when rolling aluminum foil; at the same time, the long strip of TiAl 3 The phase is difficult to completely dissolve, so that the solute Ti cannot be uniformly distributed throughout the melt

Therefore, when using this refinement process, due to the coarse TiAl 3 Incomplete phase dissolution and diffusion, adhesion of TiB 2 Particle aggregates cannot be dispersed, so that the refinement efficiency of Al-Ti-B master alloy is very low, and the grain size of industrial pure aluminum as-cast after refinement by this process is generally greater than 150 μm